monty said:I'm not sure what Jean is getting at by mentioning "hue" as distinct from color-- in my experience, hue is defined as the "normalized" color, in systems like HLS and HSV that try to separate out color from "intensity"/"lightness"/"brightness" and "saturation," so I don't understand how an animal could make sense of "hue" without color vision.
I think I was thinking more of tone and/or shade. I'm a little colour blind (due to retinal damage! not true colour blindness) and I have great difficulty with greens, yellows and strangely grey. This is because I see some greens and yellows as grey For example Lime green, lemon yellow and a kind of palish grey all look the same to me. Made it rather difficult when I worked in a department store's dress making area and had to match thread to fabric in these colours. Eventually we organised the thread display and separated these shades and wrote the colour on the fabric bolt BUT my point is if I knew that the fabric was lemon yellow I could go to the thread and pick out EXACTLY the right shade of thread to match but I wasn't using colour I was matching the shade of the grey that I see. I do the same now with my bead work. I think I do use some of the saturation as well, but it's kinda hard to explain to people with normal colour vision! (just as hard to explain "green" or "yellow" to me!!!)
Used to have a lot of "fun" matching pH colours now I use a digital pH meter!